Does anyone know what is more correct the firestones or goodyears? Also does the build date /assembly plant make a difference what came on the car when it was new?I have a 11d los built 69z . Goodyears or firestones? thanks John

John, there were several tires used on a 1969 Z28. Firestone Sport 200 E70, Goodyear Speedway Wide Tread GT and Uniroyal Tiger Paw. Cannot comment on whether LA used one, two or all three brands of tires and when, i would guess as GM clearly used several suppliers it must have been whatever was available at time of assembly.

While the rate Camaros were produced at could not change, the mix could. High-Performance cars are in far greater demand during the early spring months tapering off into summer.

For example Sep '68 only 3.6% of production were Z/28; Feb '69 it was 13%. So production planners know they need 14,560 E70 x 15 tires for February; about 130 per day at peak. Goodyear knows it can't make them at that rate; Chevy looks for another supplier to cover the peaks. Both suppliers had to warehouse and ship from stock so which was on the line when is impossible to determine. They were probably mixed; cars built within minutes of each other could have different brands.